A load switch and a meter

Abstract

This utility model provides a load switch and an electricity meter, relating to the field of electrical equipment technology. The load switch includes a housing, a first terminal block, a second terminal block, a stationary contact, a drive mechanism, a moving contact, and an arc-extinguishing chamber. The second terminal block is spaced apart from the first terminal block. The stationary contact is connected to the second terminal block; the moving contact is connected to the first terminal block. The arc-extinguishing chamber includes an equipotential bonding element and a grid. The equipotential bonding element is electrically connected to the first terminal block, and the grid is disposed between the first and second terminal blocks. An equipotential bonding element, equipotential to the moving contact, is placed near the moving contact. After the moving and stationary contacts separate and generate an arc, the arc root transfers from the moving contact to the equipotential bonding element, thereby forcibly transferring the arc from the gap between the moving and stationary contacts to the gap between the equipotential bonding element and the stationary contact, greatly protecting the moving contact. Furthermore, this load switch improves arc-extinguishing efficiency, thereby improving the breaking capacity of the load switch.

Description

Technical Field

[0001] This utility model relates to the field of electrical equipment technology, and more specifically, to a load switch and an electricity meter. Background Technology

[0002] Load switches are core devices in power systems used for circuit connection, disconnection, and protection. They can interrupt rated load current and a certain overload current by the contact or separation of their internal moving and stationary contacts, thus closing or opening the circuit. When the moving contact moves away from the stationary contact to begin the disconnection, a highly conductive plasma channel, known as an electric arc, is generated between the contacts. If the arc cannot be extinguished quickly, current will continue to flow, and the circuit will not actually be broken. This not only fails to complete the disconnection operation but also causes serious hazards. Therefore, an arc-extinguishing chamber is installed inside the load switch to extinguish the electric arc generated when the circuit is disconnected.

[0003] However, the effect of the arc-extinguishing chamber in the current load switch is generally not very good. Utility Model Content

[0004] This utility model provides a load switch and meter that can improve arc extinguishing efficiency, protect moving contacts, and extend the service life of the load switch.

[0005] The embodiments of this utility model can be implemented as follows: An embodiment of this utility model provides a load switch, which includes: case; A first terminal block, a portion of which is located inside the housing, and a portion of which is located outside the housing; The second terminal block has a portion located inside the housing and a portion located outside the housing; the second terminal block is spaced apart from the first terminal block. A stationary contact, which is connected to the second terminal block; A drive mechanism, wherein the drive mechanism is disposed within the housing; A moving contact is connected to the driving mechanism, which drives the moving contact to close or separate from the stationary contact; the moving contact is connected to the first terminal block. An arc-extinguishing chamber, comprising an equipotential bonding element and a grid plate, wherein the equipotential bonding element is electrically connected to the first terminal block, and the grid plate is disposed between the first terminal block and the second terminal block.

[0006] In an optional embodiment, the equipotential bonding element is U-shaped, and the opening of the equipotential bonding element faces away from the moving contact.

[0007] In an optional embodiment, the number of moving contacts is multiple; the equipotential bonding element includes an equipotential plate and multiple equipotential plates spaced apart on the equipotential plate; the multiple equipotential plates are arranged in a one-to-one correspondence with the multiple moving contacts; at least one of the equipotential plates is connected to the equipotential plate in a "U" shape.

[0008] In an optional embodiment, there are multiple grid plates, which are spaced apart along the direction from the first terminal block to the second terminal block; and the length of the grid plate closest to the equipotential member is less than the length of the other grid plates.

[0009] In an optional embodiment, the distance between the grid plate and the inner wall of the housing gradually increases along the direction from near the equipotential member to near the stationary contact.

[0010] In an optional embodiment, the arc-extinguishing chamber further includes a stationary arc-drawing plate, which is electrically connected to the stationary contact, and the grid plate is located between the equipotential member and the stationary arc-drawing plate.

[0011] In an optional embodiment, the stationary arc-leading piece is connected to the second terminal block, and the stationary arc-leading piece extends along the extension direction of the second terminal block.

[0012] In an optional embodiment, the stationary arc-drawing plate includes a connecting portion and an arc-drawing portion. The connecting portion is connected to the second terminal block, and the arc-drawing portion is connected to the connecting portion. The arc-drawing portion and the second terminal block are spaced apart. The distance between the arc-drawing portion and the second terminal block gradually increases along the direction of the second terminal block from the stationary contact to the distance from the stationary contact.

[0013] In an optional embodiment, the minimum distance between the equipotential bonding element and the stationary arc-drawing plate is greater than the distance between the moving contact and the stationary contact when the circuit is open.

[0014] In an optional embodiment, the moving contact is connected to the first terminal block via a flexible connection, such that the moving contact, the flexible connection, and the first terminal block are connected in a U-shape.

[0015] An embodiment of this utility model also provides an electricity meter, including the load switch described in any of the above embodiments.

[0016] The beneficial effects of the load switch and meter of this utility model embodiment include, for example: The load switch includes a housing, a first terminal block, a second terminal block, a stationary contact, a drive mechanism, a moving contact, and an arc-extinguishing chamber. The first terminal block is connected to the housing, with a portion inside the housing and a portion outside. The second terminal block is also connected to the housing, with a portion inside and a portion outside. The second terminal block is spaced apart from the first terminal block. The stationary contact is connected to the second terminal block. The drive mechanism is located inside the housing. The moving contact is driven by the drive mechanism, which drives the moving contact to close or separate from the stationary contact. The moving contact is connected to the first terminal block. The arc-extinguishing chamber includes an equipotential bonding element and a grid. The equipotential bonding element is electrically connected to the first terminal block, and the grid is positioned between the first and second terminal blocks. An equipotential bonding element, at the same potential as the moving contact, is placed near the moving contact. When the moving and stationary contacts separate and an arc is generated, the resistance between the equipotential bonding element and the grid is lower than the resistance between the moving contact and the grid. Current flows through the loop with lower resistance, thus transferring the arc root from the moving contact to the equipotential bonding element. This forces the arc from the gap between the moving and stationary contacts to the gap between the equipotential bonding element and the stationary contact, preventing current from flowing over the moving contact tip and protecting it from direct arc erosion, greatly protecting the moving contact. Furthermore, the equipotential bonding element can quickly transfer the arc to the grid, improving arc extinguishing efficiency and thus increasing the breaking capacity of the load switch. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of a load switch provided in an embodiment of the present invention; Figure 2 This is a schematic diagram from a first-view perspective of a load switch, which includes only a portion of the structure, provided in an embodiment of this utility model. Figure 3 This is a schematic diagram from a second perspective of a load switch, showing only a portion of its structure, provided in an embodiment of this utility model. Figure 4 This is a schematic diagram of the equipotential bonding element provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of an arc-extinguishing chamber consisting only of grid plates, provided in an embodiment of the present invention.

[0019] Icons: 1000-Load switch; 100-Housing; 200-First terminal block; 300-Second terminal block; 400-Stationary contact; 500-Drive mechanism; 600-Moving contact; 700-Arc extinguishing chamber; 710-Equipotential bonding element; 711-Equipotential plate; 712-Equipotential bonding sheet; 720-Grid plate; 730-Stationary arc ignition plate; 731-Connection part; 732-Arc ignition part. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0024] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0025] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0026] Load switches are core devices in power systems used for circuit connection, disconnection, and protection. They can interrupt rated load current and a certain overload current by the contact or separation of their internal moving and stationary contacts, thus closing or opening the circuit. When the moving contact leaves the stationary contact to begin the disconnection, an extremely hot and electrically charged plasma channel, i.e., an electric arc, is generated between the contacts. If the arc cannot be extinguished quickly, current will continue to flow, and the circuit will not actually be broken. This not only fails to complete the disconnection operation but also causes serious hazards. Therefore, an arc-extinguishing chamber is installed inside the load switch to extinguish the arc generated when the circuit is disconnected. However, the effectiveness of the arc-extinguishing chambers in current load switches is generally limited.

[0027] Based on this, please refer to Figure 1 , Figure 2 and Figure 3 The load switch 1000 provided in the embodiments of this utility model can improve the aforementioned technical problems. This load switch 1000 can forcibly transfer the electric arc from the gap between the moving contact 600 and the stationary contact 400 to the gap between the equipotential bonding element 710 and the stationary contact 400, preventing current from flowing through the end of the moving contact 600 and protecting it from direct arc erosion, thus greatly protecting the moving contact 600. Furthermore, the equipotential bonding element 712 can also quickly transfer the electric arc to the grid 720, improving arc extinguishing efficiency and thus enhancing the breaking capacity of the load switch 1000. The load switch 1000 can be applied to electrical equipment or systems such as electricity meters. All equipment or systems with this load switch 1000 have the same functions as described above, and will not be elaborated further here.

[0028] The improved electricity meter in this embodiment includes a load switch 1000. Of course, the electricity meter may also include other structures such as a sampling circuit and a display unit, which are not limited here.

[0029] Figure 1 This is a schematic diagram of the load switch 1000 provided in an embodiment of the present utility model; Figure 2 This is a schematic diagram from a first-view perspective of a load switch 1000, which includes only a portion of the structure, provided in an embodiment of this utility model. Figure 3 This is a schematic diagram from a second perspective of a load switch 1000, which includes only a portion of the structure, provided in an embodiment of this utility model.

[0030] The load switch 1000 provided in the embodiments of this utility model includes a housing 100, a first terminal block 200, a second terminal block 300, a stationary contact 400, a drive mechanism 500, a moving contact 600, and an arc-extinguishing chamber 700. A portion of the first terminal block 200 is located inside the housing 100, and a portion of the first terminal block 200 is located outside the housing 100; a portion of the second terminal block 300 is located inside the housing 100, and a portion of the second terminal block 300 is located outside the housing 100; the second terminal block 300 and the first terminal block 200 are spaced apart. The stationary contact 400 is connected to the second terminal block 300; the drive mechanism 500 is disposed inside the housing 100; the moving contact 600 is connected to the drive mechanism 500 in a transmission manner, and the drive mechanism 500 is used to drive the moving contact 600 to move in order to close or separate from the stationary contact 400; the moving contact 600 is connected to the first terminal block 200; the arc-extinguishing chamber 700 includes an equipotential bonding element 710 and a grid plate 720, the equipotential bonding element 710 is electrically connected to the first terminal block 200, and the grid plate 720 is disposed between the first terminal block 200 and the second terminal block 300. An equipotential bonding element 710, at the same potential as the moving contact 600, is placed near the moving contact 600. After the moving contact 600 and the stationary contact 400 separate and generate an arc, because the resistance between the equipotential bonding element 710 and the grid plate 720 is lower than the resistance between the moving contact 600 and the grid plate 720, current flows through the loop with lower resistance. This transfers the arc root from the moving contact 600 to the equipotential bonding element 710, and further forces the arc from the gap between the moving contact 600 and the stationary contact 400 to the gap between the equipotential bonding element 710 and the stationary contact 400. This prevents current from flowing through the end of the moving contact 600, protecting it from direct arc erosion and greatly protecting the moving contact 600. Furthermore, the equipotential bonding element 712 can also quickly transfer the arc to the grid plate 720, improving arc extinguishing efficiency and thus increasing the breaking capacity of the load switch 1000.

[0031] Please see Figure 2 In this embodiment, the moving contact 600 is connected to the first terminal block 200 via a flexible connection, forming a U-shape with the moving contact 600, the flexible connection, and the first terminal block 200. When current flows through this U-shape, a repulsive force is generated between the moving contact 600 and the flexible connection and / or between the moving contact 600 and the first terminal block 200, thereby enhancing the contact pressure between the moving contact 600 and the stationary contact 400. Of course, the moving contact 600 can also be connected to the first terminal block 200 through other connection methods, which are not limited here.

[0032] Please see Figure 1In this embodiment, the equipotential bonding element 710 is U-shaped, with its opening facing away from the moving contact 600. The bottom (closed end) of the U-shape is close to the initial arcing position when the moving contact 600 is opened, facilitating the transfer of the arc root. The opening of the equipotential bonding element 710 facing away from the moving contact 600 forces the arc to be stretched towards the grid 720 of the arc-extinguishing chamber 700, accelerating arc cooling, improving arc transfer efficiency, and thus enhancing the breaking capacity of the load switch 1000. Of course, the equipotential bonding element 710 can also be designed as a straight plate, an inclined flat plate, or other shapes; this is not limited here.

[0033] To improve arc transfer efficiency, the equipotential bonding element 710 in this embodiment is located below the moving contact 600. Of course, the equipotential bonding element 710 can also be located in other positions, which is not limited here.

[0034] Please continue reading. Figure 1 To quickly guide the arc at the stationary contact 400 to the arc-extinguishing chamber 700 and prevent arc drift, the arc-extinguishing chamber 700 in this embodiment also includes a stationary arc-inducing plate 730. The stationary arc-inducing plate 730 is electrically connected to the stationary contact 400, and the grid plate 720 is located between the equipotential member 710 and the stationary arc-inducing plate 730. By setting the stationary arc-inducing plate 730, the root of the arc can be forcibly anchored on the stationary arc-inducing plate 730, preventing the arc from wandering randomly on the surface of the stationary contact 400.

[0035] Specifically, in this embodiment, the stationary arc-inducing piece 730 is connected to the second terminal block 300, and the stationary arc-inducing piece 730 extends along the extending direction of the second terminal block 300. The stationary arc-inducing piece 730 includes a connecting portion 731 and an arc-inducing portion 732. The connecting portion 731 is connected to the second terminal block 300, and the arc-inducing portion 732 is connected to the connecting portion 731. The arc-inducing portion 732 is spaced apart from the second terminal block 300. The distance between the arc-inducing portion 732 and the second terminal block 300 gradually increases along the direction of the second terminal block 300 from near the stationary contact 400 to far away from the stationary contact 400. That is, the arc-inducing portion 732 is closer to the grid plate 720, which shortens the distance the arc needs to transfer from the stationary arc-inducing piece 730 to the grid plate 720, guides the arc to move towards the grid plate 720, ensures that the arc accurately enters the grid plate 720, and improves the arc extinguishing efficiency of the grid plate 720.

[0036] In order to ensure the arc-initiating effect of the equipotential bonding element 710, the minimum distance between the equipotential bonding element 710 and the stationary arc-initiating piece 730 in this embodiment is greater than the distance between the moving contact 600 and the stationary contact 400 when the circuit is open, so that the arc is further lengthened and the arc-extinguishing effect is improved.

[0037] Figure 4 This is a schematic diagram of the equipotential bonding element 710 provided in an embodiment of this utility model. Please refer to... Figure 4 and combined Figures 1 to 3In this embodiment, there are multiple moving contacts 600; the equipotential bonding element 710 includes an equipotential plate 711 and multiple equipotential plates 712 spaced apart on the equipotential plate 711; the equipotential plate 711 is electrically connected to the first terminal block 200, and the multiple equipotential plates 712 are correspondingly arranged one-to-one with the multiple moving contacts 600; at least one equipotential plate 712 is connected to the equipotential plate 711 in a "U" shape. Multiple moving contacts 600 connected in parallel can proportionally distribute the total current to each contact channel, evenly distribute the current, reduce the electrodynamic repulsion force of the moving contacts 600, and prevent the contacts from repelling and welding. By setting multiple equipotential bonding elements 710, the current density on the equipotential bonding elements 710 can be increased. Each time the circuit breaks, the arc will only be generated on one of the contacts. The spaced arrangement of multiple equipotential plates 712 can reduce the current-carrying area, thus increasing the current density. Magnetic blowout is proportional to the current density; the higher the current density, the stronger the magnetic blowout of the arc, thereby accelerating the arc transfer speed and quickly extinguishing the arc. In addition, it can make the heat load distribution of the arc-extinguishing chamber 700 uniform, avoiding local overheating failure. Multiple independent arc-extinguishing units work synchronously, dividing the total arc into N independent small arcs. Each small arc is independently transferred into the grid plate 720 under the guidance of its own equipotential plate 712, which can further shorten the total arcing time and improve the breaking capacity of the load switch 1000.

[0038] Furthermore, all of the equipotential bonding plates 712 may be U-shaped, or only some of them may be U-shaped; this is not limited here. Optionally, the ends of the equipotential bonding plates 712 in this embodiment are arc-shaped, which is beneficial for electric field concentration and arc initiation. Of course, the equipotential bonding plates 712 can also be designed in other shapes, and the ends of the equipotential bonding plates 712 can also be designed in other shapes; this is not limited here.

[0039] Figure 5 This is a schematic diagram of an arc-extinguishing chamber 700 including only the grid plate 720, provided as an embodiment of the present invention. Please refer to... Figure 5 and combined with 1 and Figure 2 In this embodiment, there are multiple grid plates 720, which are arranged at intervals along the direction from the first terminal block 200 to the second terminal block 300. That is, the multiple grid plates 720 are located within the space formed by the first terminal block 200 and the second terminal block 300, making full use of the internal space of the load switch 1000. This design improves arc extinguishing efficiency. Furthermore, the grid plates 720 form heat dissipation channels at intervals. After the high-temperature arc is divided, each short arc segment adheres closely to the surface of the grid plate 720, and heat is quickly dissipated through thermal conduction. The airflow between the grid plates 720 generates a turbulence effect, enhancing convective heat dissipation and improving the arc cooling effect. In this embodiment, there are three grid plates 720. Of course, there can also be two, four, five, or more, which is not limited here. The multiple grid plates 720 can be evenly spaced or arranged in other ways, such as densely packed, which is not limited here.

[0040] Furthermore, in this embodiment, the length of the grid plate 720 closest to the equipotential bonding element 710 is shorter than the length of the other grid plates 720. This design allows the grid plate 720 to avoid the moving contact 600, enabling the arc-extinguishing chamber 700 to be installed as a module for easy tooling, and ensuring that the arc-extinguishing chamber 700 does not interfere with the moving contact 600 during installation.

[0041] The arc energy is most concentrated near the equipotential bonding element 710 at the transfer initiation point. As it moves towards the stationary contact 400, its energy gradually decreases after being segmented and cooled by the grid plates 720. In this embodiment, the spacing between the grid plates 720 and the inner wall of the housing 100 gradually increases along the direction from near the equipotential bonding element 710 to near the stationary contact 400. This design can adapt to the arc energy attenuation gradient, eliminate gas turbulence, and suppress insulation breakdown. The small-pitch end of the grid plates 720 forms a high-voltage jet zone, which can accelerate arc extinguishing. The large-pitch end of the grid plates 720 provides an expansion buffer zone to prevent airflow rebound. The gradually changing spacing forms an expanding flow channel, which can suppress eddy current generation and improve arc extinguishing efficiency. Of course, the spacing between the multiple grid plates 720 and the inner wall of the housing 100 along the direction from near the equipotential bonding element 710 to near the stationary contact 400 can also be consistent, which is not limited here.

[0042] Optionally, the housing 100 in this embodiment has an air outlet for heat dissipation. In this embodiment, the air outlet is located on the housing 100 at a position corresponding to the arc-extinguishing chamber 700. Of course, the air outlet can also be located on the bottom of the housing 100 or other positions, and is not limited here.

[0043] In summary, the load switch 1000 includes a housing 100, a first terminal block 200, a second terminal block 300, a stationary contact 400, a drive mechanism 500, a moving contact 600, and an arc-extinguishing chamber 700. A portion of the first terminal block 200 is located inside the housing 100, and a portion is located outside the housing 100; a portion of the second terminal block 300 is located inside the housing 100, and a portion is located outside the housing 100; the second terminal block 300 and the first terminal block 200 are spaced apart; the stationary contact... 400 is connected to the second terminal block 300; the drive mechanism 500 is disposed inside the housing 100; the moving contact 600 is connected to the drive mechanism 500 in a transmission manner, and the drive mechanism 500 is used to drive the moving contact 600 to move in order to close or separate from the stationary contact 400; the moving contact 600 is connected to the first terminal block 200; the arc extinguishing chamber 700 includes an equipotential member 710 and a grid plate 720, the equipotential member 710 is electrically connected to the first terminal block 200, and the grid plate 720 is disposed between the first terminal block 200 and the second terminal block 300. An equipotential bonding element 710, at the same potential as the moving contact 600, is placed near the moving contact 600. After the moving contact 600 and the stationary contact 400 separate and generate an arc, because the resistance between the equipotential bonding element 710 and the grid plate 720 is lower than the resistance between the moving contact 600 and the grid plate 720, current flows through the loop with lower resistance. This transfers the arc root from the moving contact 600 to the equipotential bonding element 710, and further forces the arc from the gap between the moving contact 600 and the stationary contact 400 to the gap between the equipotential bonding element 710 and the stationary contact 400. This prevents current from flowing through the end of the moving contact 600, protecting it from direct arc erosion and greatly protecting the moving contact 600. Furthermore, the equipotential bonding element 712 can also quickly transfer the arc to the grid plate 720, improving arc extinguishing efficiency and thus increasing the breaking capacity of the load switch 1000.

[0044] The above description is only a specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A load break switch characterized by, include: Casing (100); A first terminal block (200) is located inside the housing (100), and a portion of the first terminal block (200) is located outside the housing (100); The second terminal block (300) has a portion located inside the housing (100) and a portion located outside the housing (100); the second terminal block (300) is spaced apart from the first terminal block (200); A stationary contact (400) is connected to the second terminal block (300); A drive mechanism (500) is disposed within the housing (100); A moving contact (600) is connected to a driving mechanism (500), which drives the moving contact (600) to move in order to close or separate from the stationary contact (400); the moving contact (600) is connected to the first terminal block (200). An arc-extinguishing chamber (700) includes an equipotential bonding element (710) and a grid plate (720). The equipotential bonding element (710) is electrically connected to the first terminal block (200), and the grid plate (720) is disposed between the first terminal block (200) and the second terminal block (300).

2. The load break switch according to claim 1, characterized in that The equipotential element (710) is U-shaped, and the opening of the equipotential element (710) faces away from the moving contact (600).

3. The load break switch according to claim 2, characterized in that The number of moving contacts (600) is multiple; the equipotential element (710) includes an equipotential plate (711) and multiple equipotential plates (712) spaced apart on the equipotential plate (711); the multiple equipotential plates (712) are arranged in a one-to-one correspondence with the multiple moving contacts (600); at least one of the equipotential plates (712) is connected to the equipotential plate (711) in a "U" shape.

4. The load break switch of claim 1, wherein, The number of the grid plates (720) is multiple, and the multiple grid plates (720) are arranged at intervals along the direction from the first terminal block (200) to the second terminal block (300); and the length of the grid plate (720) closer to the equipotential member (710) is less than the length of the other grid plates (720).

5. The load switch according to claim 4, characterized in that, Along the direction from near the equipotential member (710) to near the stationary contact (400), the distance between the grid plate (720) and the inner wall of the housing (100) gradually increases.

6. The load switch of claim 1, wherein, The arc-extinguishing chamber (700) further includes a stationary arc-drawing plate (730), which is electrically connected to the stationary contact (400), and the grid plate (720) is located between the equipotential member (710) and the stationary arc-drawing plate (730).

7. The load break switch according to claim 6, characterized in that The stationary arc-leading piece (730) is connected to the second terminal block (300), and the stationary arc-leading piece (730) extends along the extension direction of the second terminal block (300); The stationary arc-drawing plate (730) includes a connecting part (731) and an arc-drawing part (732). The connecting part (731) is connected to the second terminal block (300), and the arc-drawing part (732) is connected to the connecting part (731). The arc-drawing part (732) and the second terminal block (300) are spaced apart. The distance between the arc-drawing part (732) and the second terminal block (300) gradually increases along the direction from the second terminal block (300) closer to the stationary contact (400) to farther away from the stationary contact (400).

8. A load switch according to claim 6 or 7, characterised in that, The minimum distance between the equipotential element (710) and the stationary arc-drawing plate (730) is greater than the distance between the moving contact (600) and the stationary contact (400) when the circuit is open.

9. The load break switch according to any one of claims 1-7, characterized in that The moving contact (600) is connected to the first terminal block (200) via a flexible connection, so that the moving contact (600), the flexible connection and the first terminal block (200) are connected in a U-shape.

10. An electricity meter characterized by Includes the load switch (1000) as described in any one of claims 1-9.

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